从头认识多线程-2.13 synchronized ()代码块不单可以用this，也可以用其他对象

这一章节我们来讨论一下synchronized ()代码块的另一个用法，它不单可以用this，也可以用其他对象。

1.代码清单

package com.ray.deepintothread.ch02.topic_13;/** *  * @author RayLee * */public class ObjectLock {public static void main(String[] args) throws InterruptedException {MyService myService = new MyService();ThreadOne threadOne = new ThreadOne(myService);Thread thread = new Thread(threadOne);thread.start();ThreadTwo threadTwo = new ThreadTwo(myService);Thread thread2 = new Thread(threadTwo);thread2.start();}}class ThreadOne implements Runnable {private MyService myService;public ThreadOne(MyService myService) {this.myService = myService;}@Overridepublic void run() {try {myService.updateA();} catch (InterruptedException e) {e.printStackTrace();}}}class ThreadTwo implements Runnable {private MyService myService;public ThreadTwo(MyService myService) {this.myService = myService;}@Overridepublic void run() {try {myService.updateB();} catch (InterruptedException e) {e.printStackTrace();}}}class MyService {private Object object;public MyService() {object = new Object();}public void updateA() throws InterruptedException {synchronized (object) {long startTime = System.currentTimeMillis();System.out.println("updateA startTime:" + startTime);Thread.sleep(1000);long endTime = System.currentTimeMillis();System.out.println("updateA endTime:" + endTime);}}public void updateB() throws InterruptedException {synchronized (object) {long startTime = System.currentTimeMillis();System.out.println("updateB startTime:" + startTime);Thread.sleep(1000);long endTime = System.currentTimeMillis();System.out.println("updateB endTime:" + endTime);}}}

输出：

updateA startTime:1462455786957
updateA endTime:1462455787958
updateB startTime:1462455787958
updateB endTime:1462455788958

2.结论

从输出可以看见，跟前面章节的代码相比，我们把synchronized ()里面的this换成一个new Object（），而且这个object不一定是object，可以是任何对象

总结：这一章节展示了synchronized ()代码块的另一个用法，它不单可以用this，也可以用其他对象。

这一章节就到这里，谢谢

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我的github：https://github.com/raylee2015/DeepIntoThread

目录：http://blog.csdn.net/raylee2007/article/details/51204573

这一章节就到这里，谢谢

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我的github：https://github.com/raylee2015/DeepIntoThread

目录：http://blog.csdn.net/raylee2007/article/details/51204573